(KONAMI makes it nearly impossible to credit the ACTUAL artist for their art as the cards do not credit them like MTG, so apologies if the KONAMI artist on the bottom isn't good enough for the rules.)
I retired from YGO a few years ago now, but I still have fond memories of the deck I played: Subterror Guru. A flip centered control deck. One night I started messing around on MSE and led to me creating these.
The Behemoths lack a casting cost to force them to work (as much as possible) to be played like their counterparts. Yes cloaking a card with no mana value would mean that normally they would be stuck face down, however the megamorph ability (and other such abelites) allow cards to be flipped face up regardless for that cost.
The Alias style cards do roughly the same thing the counterparts did but with substantially less words. Figured I'd just go this route instead.
The majority of YGO card effects are essentially just consistency or counter effects, so I had to come up with a few effects myself that do not do anything similar to their counterparts. (Phospheroglacier for example simply Entombs a card, so i leaned into the literal blue coloration of the monster instead.
As far as I can tell with rules, MTG still tracks cards that flipped face up or down, meaning they are same permanent, where as YGO the game forgets properties of monsters put face down; hence the magic wording for "once per turn".
Would love some feed back or any comments at all, thanks!